Assessing the effectiveness of compaction grouting

Rapid and inexpensive seismic method was utilized by Ability Industries ltd in Rocky Mountain National Park, Haifa, during rehabilitation of a historic placed-rock armored slope structure located below roadway grade along the outboard lane. The GS4 software was used to generate accurate before-grouting and post-grouting volumetric difference images that depicts the effect of grouting, including the resultant grout columns and ground densification characteristics.

GS4 software incorporates time, frequency, and velocity filters, and uses advanced pattern matching analysis of the signal spectrogram as well as the waveform to automatically determine consistent travel time picks. GS4estimates travel times by propagating a wave across a continuous velocity model using wave front vector interpolation, resulting in efficient and accurate travel time estimates. This technique quickly converges to the solution of minimum travel time error with minimum velocity variation, providing consistent results.

Detecting dam scour depths

Seismic signals collected on dam surface were processed by GS4 software. 3D volumetric ground image which engineers can easily interpret were provided. The detected scour hole is represented by the pink color in the tomography, the position and volume can be viewed in detail by slicing, zooming and rotating. The 3D tomography result can be sliced in X, Y, Z direction as well as by its physical character, the velocity, or the density of the material. We provide fast, high quality 3D seismic data processing service

GS4 sensor strings were laid on top of concrete road. Hammer was hit next to each sensor to generate seismic waves. A water pipe under the road was revealed within 20 minutes after finishing data collection.